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Full text of "The Morphology And Evolution Of The Apes And Man"

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LEMTJBOIDBA                               17
pared with those in the higher Primates it will be found that the latter have a more extensive line system, with a consequently more acute tactile sense.
Vibxissae.—Pocock points out that the most generalized arrangement is present in the Mouse Lemur (Chiro-galeus). There are tufts above the eye (superciliary), round the mouth (mystaciaD, on the cheeks (genal), and below the chin (submental). All groups are present in Chiromys, and most species of Lemur. In the G-alagos and. Lorises the complement is less, the subniental tuft suffering most. Carpal vibrissse are absent in Asiatic and African Lemurs, but are present in the species from Madagascar.
Hair Slope,—The primitive hair-slope, which runs from the head backwards to the tail, is modified in the Lemurs. The hairs from the brow slant backwards and mingle with two streams passing upwards on the back of the neck. And the mid-dorsal line of the back forms a focus to which hairs are directed from the shoulders and the sides of the body. Hairs are directed downwards over the thighs, and the hairs on the arm and forearm converge towards the elbow-joint, as in the Apes. On the ventral aspect of the trunk the hairs form a spiral on each half of the abdominal wall; and Duckworth (50) regards it as characteristic of the Lemurs alone.
Peculiar Glands.—Special modified sebaceous glands have been found on the wrist and shoulder and round the anus. Their function is, however, not at all clear. Possibly they exert an erotic action,
Skeleton,—If the skull of any true Lemur (fig. 11) is compared with that of a Dog, it will be seen that in both the facial part is elongated to form a snout, the 2